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#1 |
Registered User
Join Date: Aug 2004
Location: Folsom, Ca
Posts: 573
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electronic speedo?
So i am planting my L31 vortec 350 in my c10 with my 4L60E transmission. So i have been told if you use the new 90-91 blazer or suburban gauge cluster you can use input from the transmission.. my question is how to i hook up the input to the cluster.
Thanks Billy |
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#2 |
Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: electronic speedo?
From what I understand, the electric speedometer uses three inputs. There is a 12+, ground, and a signal from the PCM. All three of these will plug into the rear of the cluster, and just need to be connected accordingly. At least this is how I understand it.
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#3 |
Registered User
Join Date: Oct 2009
Location: Waterboro ,MAINE
Posts: 547
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Re: electronic speedo?
there will be one one coming from the PCM it will hook up too the speedometer
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#4 |
Registered User
Join Date: Aug 2004
Location: Folsom, Ca
Posts: 573
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Re: electronic speedo?
Copy that guys thanks for the insight i have my speedo coming.. im just torn weather i should mod the OEM harness or to do a standalone.. the standalone seem to be pretty pricey ranging from $400-700 not including a tune.. waitforme said they would tune for 85 bucks so this is where im at right now.. the painter has the truck so i have some time.
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#5 | |
Registered User
Join Date: Oct 2009
Location: Waterboro ,MAINE
Posts: 547
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Re: electronic speedo?
Quote:
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#6 |
Registered User
Join Date: Aug 2004
Location: Folsom, Ca
Posts: 573
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Re: electronic speedo?
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#7 |
Jonny
Join Date: Apr 2008
Location: Outside the Box, Austin,TX
Posts: 741
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Re: electronic speedo?
If you decide to mod your existing harness I suggest getting the original schematic and drawing out where you are going to tie inyour new harness. A little extra time in the planning will save alot of time in the "oh, $h!t"
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1966 C30, Cummins, stacks, and a flat bed in progress... "Honor.....simply put, A veteran - whether active duty, retired, national guard or reserve is someone who, at one time in his life, wrote a blank check made payable to 'The United States of America', for an amount of 'up to and including his life.' That is Honor, and there are way too many people in this country who no longer understand it." -AEC Hundley USNR |
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#8 | |
Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: electronic speedo?
Quote:
I went ahead and picked up an electric cluster too. Hopefully I can get the gauges to work now. |
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#9 |
Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
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Re: electronic speedo?
I don't know what kind of signal the L31 vortec PCM is looking for from the VSS but on the LT1 & TPI swaps I have done they both worked perfectly using a dual output VSS from a 93 vintage Caprice cop car. VSS-231 at NAPA if I remember right.
It has both the mechanical speedo output and the VSS output on it so I was able to keep the stock cable driven speedometer but still give the ECM/PCM what it needed too. The mechanical side was to drive a speedo cable driven radar gun. I know it is the wrong type of signal for a TBI swap but since the L31 is port EFI I figured it might work with it too. The same VSS unit fits into a 4L60, 700R4 and a T-400.
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miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars Last edited by 68 TT; 12-01-2009 at 12:54 PM. |
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#10 |
Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: electronic speedo?
Using that VSS, what type of drive gear is used? I looked on the JTR website, and got more confused. It looks like you have to add another gear to the output shaft of the trans to get it to work. I also looked at the S&P modified tailshaft, but figured I could spend $450 a better way.
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#11 | |
Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
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Re: electronic speedo?
Quote:
You could always switch to a non-electronic 4L60 / 700R4 to save a pile of cash up front but the tuning features of the electronic trans are pretty cool and I'm not sure how the PCM would interface with the non-electronic trans to control TCC functions or how you would get the TV cable to connect to the vortec throttle body. Sounds like you are much better off using the electronic speedo and keeping the 4L60E.
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miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars |
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#12 |
Registered User
Join Date: Oct 2009
Location: Waterboro ,MAINE
Posts: 547
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Re: electronic speedo?
IF its it has 4l60e then isnt the ecm edited for what the rear end ratio and what tires size thats what happen to me they want to know what rear end i had and tire sizes
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#13 |
Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
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Re: electronic speedo?
You are correct. With the 4L60E you change settings in the programming to account for gearing and tire diameter.
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miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars |
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#14 |
Registered User
Join Date: Aug 2004
Location: Folsom, Ca
Posts: 573
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Re: electronic speedo?
Hey guys i do have the pin put of my truck i was thinking of getting the GM shop manual for the motor i pretty much have it figured out from what i have found online and a few other places. as for the transmission it is the newer electric speedo tranny just like the ones that would come in a 5.3L i dont feel like wasting money on converting the tail shaft and calibrating the gear sets to get it right when i change the wheels when it could just be tuned.
Thanks for the help guys! |
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